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Find a model number, and I'll find you a schematic. It's usually stamped on the back edge of the cabinet. Failing that, a chassis number, or as a last resort, list the tubes in it.
If this uses a 6X5 rectifier (or two), it's worth modifying to protect the power transformer if (when) one fails shorted. A line fuse is a start - better is a separate filament transformer for the 6X5s.
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